Carbid-furnace.



No. 630,966. Paten ted Aug. l5, I899.

L. K. BUHM.

CARBID FURNACE.

(Applicution filed June 15, 1896. Renewed May 25, 1898.) (No Model.)

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INVENT R "m: warms Pcrzns 120., mumumou WASHINGTON, n. c.

' UNITED STATES PATENT OFFICE.

LUDNVIG K. JUI'IM, OF NEW YORK, N. Y., ASSIGNOR TO THE ELEOTRO GAS COMPANY, OF VEST VIRGINIA.

CARBlD-FURNACE.

SPECIFICATION forming part of Letters Patent No. 630,966, dated August 15, 1899.

Application filed June 15, 1896, Renewed May 25, 1898. Serial No; 881,756. No model) TO who?! it may 6077/0677 shows the carbons in contactwith their inside Beitknown thatI, LUDWIGK. Bonn, asubportions, while Fig. shows them in contact ject of the Emperor of Germany, residing at with each other throughout their whole width. New York, in the county and State of New The carbons are two, three, or four inches in 5 York, have invented certain new and useful diameter, accordingto the size of the furnace, Improvements in Carbid-Furnaces, of which and are preferably twenty-four inches long. the following is a specification. They are held together at their tops by a My invention relates to a carbid-furnace in tr ng metal casing Z), preferably made of copwhich carbids are made from metal oxids and per, to which are further connected two metal I0 carbon by the action of the electrical current, rods or bars 0 c, Fig. 2, which are also prefand is especially intended for the production 'erably made of copper. The metal rods or of carbid of calcium from a mixture of calbars unite at their top ends and carry there cium oxid and powdered carbon. a metal plate 0, into which lead the cables 0 It is the special object of my invention to which conduct the electrical current from one 15 provide a carbid-furnace of high efficiency by pole of the electric generator or from a transvirtue of its special arrangement of the carformer into the upper electrode. The plate 0 bons forming the upper electrode. Further, is provided with a ring 0 which is connected a pure product is obtained, free of uncomwith a ring 0 of insulating material. This bined carbon, because the end of the lower ring connects with the chain D. The chain 2o electrode is formed of carbid. By means of runs over pulleys into the regulating-room, my novel arrangement I attain that, practifrom where the upper electrode is raised or cally, none of the mixture of calcium oxid and lowered, according to the indications on the powdered carbon passes through the furnace electrical measuring instruments.

without being combined. The iron vessel A, in which the carbid is 2 5 The invention is illustrated in the accomformed, rests on the iron plate'E, which is propanying drawings, in which vided with a narrow metal plate 6, into which Figure 1 is a vertical section of the essenlead the cables from the other pole of the electial parts of the electrical furnace. Fig. 2 is tric generator or from a transformer. The a side view of Fig. 1. Fig. 3 is a top plan of bottom of A is covered with carbid. The cir- 8o 30 Fig. 1 on line 00 :0. Figs. i and 5 are top plan cnit is closed by the arc which passes between views of modifications of the carbon arrangethe carbons and the carbid when the furnace ment, and Fig. 6 is a sectional view of Fig. t is in operation. on the line y y. The mixture of carbon and calcium oxid is The electrical furnace consists, essentially, introduced through the hopperF. The wheel 35 of the iron vessel A, in which the carbid is G regulates the supply of the mixture. If formed, the carbon arrangement B, which the wheel is turned quick, more material will forms the upper electrode, the device 0, to be introduced thanif the same is turned slow. whichis attached the carbon arrangement and The carbid is formed by the heat of the elecwhich is raised or lowered, with the carbons tric arc, and as it accumulates the carbon ar- 40 attached thereto, by the chain D,their0n plate rangcment is drawn up.

E, which forms part of the lower electrode, When a block of carbid of suiiicient size the hopper F, through which the mixture of has been formed, then the current is turned carbon and calcium oxid is introduced, and. off and the carbon arrangement is raised the wheel G, which regulates the supply of above A; The vesselA is now taken out and 45 the mixture of carbon and calcium oxid. The replaced by another onelike it. In this way upper electrode consists of a number of carthe furnace can be continually used. In orbons. Fig. 3 shows twelve, but more or less der to facilitate the taking out of the vessel maybe employed, according to the size of-the A, the plate E is mounted slightly oblique furnace. These carbons are all in electrical and is provided with two grooves in which I00 50 contact with each other, Figs. 3 and 5, so that slide two ribs, which form part of the bottom they practically form one big carbon. Fig. 3 of A. A is held in position by the device e.

When a is released, the vessel A may be easily taken out by means of an iron hook and the ring a. It slides out easily in the grooves of plate E.

The carbid on the bottom of the vessel A is put there in order to obtain pure carbid. If carbon is employed in its place, then the lower portion of the carbid block contains with a chimney, so that gases, chiefly carbon monoxid, which form may escape. The walls are provided with ilues. (Not shown on the drawings.)

In the described way a highly-ellicient carbid-furnace is provided which produces pure carbid.

Having now described my invention, what I claim therein as new, and desire to secure by Letters Patent, is-

1. In a carbid-furnace, the combination of the upper electrode, a carbid-tank provided with grooves in the bottom thereof, a supporting-plate for said tank arranged at an incline and provided with ribs corresponding to said grooves, a plate attached to said supporting-plate for carrying the current-cables, and carbid placed on the bottom of the tank ,for forming the surface of the lower elec by a similar metal casing, as described, and 1 the inner carbon is also connected thereto by a metal casing I), with bars which connect with the outer casing, so that it derives current from the same cables as the outside carbons. The top of easing b, Fig. 6, and the tops of its connecting-bars form edges, so that the material falls easily down.

ner carbon is of the same size and diameter as the outside ones.

The furnace is surrounded by brick walls, of which the lower portion only is shown. The wall W is provided with a door 20, which is closed while the furnace is in operation. The space between the brick walls connects f 1 trode, substantially as described.

In a carbid-furnace, the combination of an upper carbon electrode, a tank or receptacle forming the lower electrode, aribbed supporting-plate for said tank to which the currentsupply cables are connected, and a carbid coating or covering for said tank or re- 7 eeptacle, substantially as described. The in- I In testimony whereof I have hereunto set f my hand in the presence of two subscribing witnesses.

LUDWIG K. Bonn.

Witnesses:

HENRY B. Oluumx, J. F. CARROLL. 

